High in the crumbling Palace of Statues, oily Vox Verlix—the Most High Academe in name, but really no more than a lowly prisoner—is brewing a terrible plot to take over power in Edgeworld once again. Rook stumbles upon the truth when he is taken captive and forced to work for Vox. Can Rook foil Vox's plan and save the lives of his librarian colleagues?

Paul Stewart is the author of a number of previous titles for children.

Chris Riddell is an accomplished graphic artist who has illustrated many acclaimed books for children.